America's MedImmune has come up with a nasal spray that USES a live flu virus in a weakened form.

美国生物科技公司Medimmune已经生产出鼻腔喷雾剂，运用的是活性流感病毒的弱化形式。

youdao

America's MedImmune has come up with a nasal spray that USES a live flu virus in a weakened form.

美国生物科技公司Medimmune已经生产出鼻腔喷雾剂，运用的是活性流感病毒的弱化形式。

youdao